Commit Mainland Fixed Pos and Mainland Balanced to A27

[Seleucids]

There is a big need for these 2 maps in vanilla: 

Mainland balance is obviously superior to the imbalanced one so we can replace 

Mainland fixed pos is really important because we want to be able to put players at where they want to be. Ptol Iber on border, Pers Kush in the pocket. Also it allows better teamwork as some prefer pocket eco support, some prefer border skirmishes /rush.

So I will make a patch diff soon, pls approve, thanks